Blowpipe



J. HARRIS BLOWPIPE March 18, 1930.

3 Sheets-Sheet 1 Filed Sept. 12, 1925 J. HARRIS BLOWPIPE March 18, 1930.

Filed 'Sept. 12

1925 3 Sheets-Sheet 2 jig/.2

J. HARRIS March 18, I930.

BLOWPIPE Filed p 1925 3 Sheets$heet 5 Patented Mar. 18, I 1930 UNITED STATES PATENT OFFICE 4 JOHN HARRIS, OF CLEVELAND, OHIO, ASSIGNORTO THE HARRIS GLALORIFIO COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO BLOWPIPE Application filed September 12, 1925. Serial No. 55,987.

This invention relates to blowpipes, and has for its general object to increase the efficiency and simplify the construction of such devices. More limited objects of the 1nvention are :to provide a blowpipe with a tip assembly which will not only enable the tip members to be quickly and convemently applied to and removed from the heads, but which will enable large numbers of tip assemblies to be applied to the same head without danger of leakage and without injury to the connected parts; to improve the manner of distributing the mixture of oxygen and combustible gas to the passages provided therefor in the tip assembly, whereby a umform distribution of such mixture to the said passages is obtained and the danger of backfiring is reduced to a minimum; also to improve and simplify the construction and manner of operating the valves which control the supply of the oxygen andcombustible gas to the blowpipe head.

I accomplish the foregoing objects in and through the construction and arrangement of parts shown in the drawings, wherein Fig. 1 represents a side elevation and Fig. 2 a plan view of a blowpipe constructed in accordance with my invention; Fig. 3 a detail in central axial section through the head of said' pipe, the gas-supplying tubes being shown in elevation; Fig. 4 a view similar to Fig. 3, the line of section being taken axially of the mixing plug and chamber and the tip assembly being shown in elevation; Fig. 5 a detail in section of. the valve mechanism, corresponding substantially to'the lines 55 of Figs. 1 and 6; Figs. 6, 7 and 8 are details in section corresponding respectively'to the lines 66,

77 and 88 of Fig. 5; Fig. 9 is a detail in elevation of the mixing plug in the head; Figs. 10 and 11 are details in section corresponding respectively to the lines 1010 and 11-11 of Fig. 3; and Fig. 12 a detail in plan of the washer or gasket which is interposed between the ,tip block and the head.

Describing the various parts by reference characters, A represents the rear valve block and B the head of theblowpipe. The valve block is provided with connections 1 and 2 at the rear thereof for supplying oxygen and I a combustible gas respectively thereto. From I the connection 1 a passage 3 conducts the Oxygen to a chamber 4, whence the oxy en for admixture with the combustible gas orpreheating purposes delivered by a passage 5 's and a valve (to be described hereinafter) and a passage 6 to a tube 8 leading to the head B. Oxygen for cutting purposes is also con ducted fromthe chamber 4 through a valvecontrolled passage 10, chamber 11 and passage 12 to the tube 13, which also leads to the the pipe 16 to a proper passage in the head.

B. The valve construction in the block A for distributing the oxygen and combustible gas to the tubes 13 and 16 will now-be described.

The receiving end of the passage 10 is provided with an annular valve seat 10 Cooperating with said valve seat is a valve comprising a metallic block 17 having at its upper end an annular compressible valve body 18 secured to the top of the block 17 by bending around the outer edge thereof a flange 17 formed from said block. The block 17 is of" smaller diameter than the chamber 4 to provide a passageway therearound to the valve seat 10 and to the passage 5. The valve 17'-18 is normally held to its seat 10 by means of a helical spring 19 bearing at one end against the bottom of the block and having its opposite end seated in a cap 20 which is threaded into the bottom of the chamber 4. From the valve block 17 a' stem 20, which is preferably angular in section (see Fig. 8), extends through the passage 10 and into the chamber 11, being provided at 1ts upper end with a head 20 which is adapt,

22 denotes the operating lever for the valve 17, the said lever extending across the block A and being pivoted at 22 between lugs A formed on the rear of said block. This lever extends across the upper end of a stem 23 which is mounted in the cap 21 and which has at its lower end'a head 23 in the chamber-11 above the diaphragm. It will be evident that, by grasping the handle casing G and the lever 22, the movement of the lever toward the handle casing will unseat the valve 17 and permit oxygen for cutting purposes to flow through the tube 13 and that, when this grasp is relaxed, the spring 19 will seat the said valve. 4

The passages 5 and 14 each discharge into a chamber, indicated respectively at 24 and 25, the delivery of the gases into such chambers being controlled by a valve construction which will now be described, referring more particularly to the chamber'24.

Surrounding the delivery end of the passage 5 is an annular valve seat 5 Preferably in the same, plane with the edge of said seat and surrounding the chamber 24 is an annular seat 26 on'which is seated a diaphragm 27, the said diaphragm being held to its seat by means of a cap 27 which is threaded into the body B and which has an annular flange 27 5 adapted to engage a washer 28 and press the same and the peripheral portion of the diaphragm 27 against the seat 26. The means for forcing the diaphragm toward the seat 5 comprises a plug 29 having a knurled head 30, the said plug being threaded through the cap 27 and adapted to engage a backing plate 31 for the diaphragm, the said backing platehaving a stem 31 entering a central bore 29 in the said plug. It will be evident that, by screwing the plug 29 inwardly, the backing plate 31 will force the diaphragm against the "seat 5 and that, by unscrewing the plug,

oxygen will be permitted to pass through the chamber 24 to the passage 6 and thence to the tube -8.

The valve construction for controlling the supplyof combustible gas to the tube 16 is identical with that just described for the preheating oxygen supply. Referring more particularly to Figs. 5 i and 6, 25- denotes the annular seat surrounding the chamber 25, 32 the diaphragm which cooperates with the valve seat 14*, 33 the cap which forces the washer 34 and the peripheral part of the diaphragm 32 against the seat 25*, and 35, the screw plug having the bore 35 for the stem 36* of the backing plate 36.

The manner of mounting and operating the valve 17 not only prevents leakage of the high-pressure oxygen, but provides a construction which, when the parts become worn, will enable them to be conveniently and quickly replaced with new parts at a comparatively trifling expense. The same advantages which exist in the case of the valve 17 inhere in the .of the backing plates not only preventing rupture of the diaphragms but insuring proper seating of the same against their respective seats. Should occasion require, the diaphragms and other parts of the valves may be quickly removed and new parts substituted therefor at a comparatively slight cost.

' The handlecasing G, referred to hereinbefore, is fitted at its rear end upon the forward end A of the valve casing and is swaged at its front end about the tubes 13, 8 and 16, as indicated at C. From this casing, the said tubes extend to the rear end of the head B, into which they are fitted. From the connection for the pipe 13, a passage 37 leads to the central part of a cylindrical downwardly extending chamber 38 in said head. From the connection for the pipe 8 a passage 39 leads to the rear palt of a threaded bore 40 formed in an olfset part B of the head, the said bore being threaded in its rear part and provided with a forward reduced extension 40 delivering downwardly and substantially radially into an annular chamber 41 formed in the head B and surrounding the delivery end of the passage 37.-

From the connection for thepipe 16, a passage 42 extends to the bore 40, near the front end of the enlarged part thereof. Threaded into said bore is a mixing plug, indicated generally at D and having a head 43 at the rear end thereof adapted to engage a washer 44 interposed between the front face of said head and a seat on the head B surrounding the bore 40. The stem of the mixing plug is reduced in diameter for a short distance in front of the head 43, thereby providing an annular chamber 4O surrounding such reduced stem and into which chamber the passage 39 discharges. In front of such reduced stem-portion the mixing plug is enlarged and provided with a thread 43 adapted to engage the threaded interior of the bore 15. The front portion of the mixing plug is reduced in diameter, as shown at 43, to fit within the reduced front end 40 of the bore 40. The passage 42 communicates with an annular chamber 40 provided in the bore 40 in front of the threaded enlargement of the plug. The mixer plug is provided with ports 43 communicating with the chamber 40* and with ports 43 communicating with the chamber 40, the inner ends of the ports discharging into the bore 43 of the mixing plug and said bore extending from a point at the rear of the ports 43 through the front end of the plug,

' it being noted that, in front of the ports 43,

of progressively increasing cross sectional area extending to the delivery end of the plug. The preheating mixture is delivered substantially radially into the annular chamber 41 whence it is distributed to they preheating passages in the tip assembly, it being noted that this manner of delivering the mixed gases into the annular chamber, so located, reduces to a minimum the danger of back-fire into the-mixing plug and into the tubes supplying the same.

With the head thus described, I employ a tip assembly comprising a cylindrical head block 440 having a central cylindrical chamber 45 formed in the lower part thereof from which passages 44" extend upwardly, their er ends being arranged to communicate with the distributingchamber 41 for the preheating gases. The head block 440 is of such size asto fit snugly within the upper part of the chamber 38 formed in the head B. The head block 440 is also provided with a short central passage 44? adapted to form a continuation of the passage 37, the bottom of the passage 44 merging with a cylindrical chamber 44 into which the inner tip member E 4 is threaded, the top of said tip member abutting against the top of the chamber 44 and the said tip member being provided with a central bore E constituting an extension of the passages 37 and 44, the lower end of. the

said bore being reduced to provide a central orifice E for the cutting oxygen.

F denotes the outer tip member which is threaded into the lower part of the chamber 45, the upper end of said tip member being spaced from the upper end of, said chamber, thereby to provide an annular distributing chamber 45 for the preheating gases supplied through the passages 44. The tip members E and E are so constructed as to provide preheating passages 46 therebetween, the said passages being'preferably formed in the outer portion of the member E, thev outer walls of said passages being constituted by the mem-' ber F. Four such passages are shown, which extend from the chamber 45? to an annular chamber 47 formed in the tip member E and from this annular chamber convergent passages 48 deliver the preheating gases aboutthe orifice E Between the top of the head block 440 and the upper end of the chamber 38 I interpose a washer, indicated generally at G. This washer is made from a mixture of copper and asbestos and consists of an inner annular body 49 connected by narrow ribs 50 with an outer annular body 51, thereby providing elongated segmental slots 52 between the inner and outer bodies which are adapted to regis-' ter with the chamber 41 and with the passages 44. The Washer is provided at its center with a bore53 adapted to register with the passages 37 and 44.

' The tip assembly comprising the head block 440, the tip members E and F, and the washer G, is quickly and conveniently applied to the bly and of connecting it to the head prevents injury to the interengaging'parts of the head and tip assembly. The washer orgasket G prevents leakage between such assembly and the head and also prevents injury of the parts due to setting up the plug H. In pipes as usually constructed, it is impossible to use more than two or three tip assemblies with the same head before injury is done to the interengaging parts oflthe head and tip as sembly, with the result that leakage occurs. With the construction and arrangement of parts shown herein, the same head may be used with an indefinitely large number of tip assemblies, without liability to injure the connections and without any danger of leakage occurring. Furthermore, the substitution of one tip assembly for another can bemade in a quick and convenient manner.

Having thus described my invention, What I claim is 1. In a blowpipe, the combination of ahead having a chamber extending upwardly from the lower end thereof, a passage cutting oxygen leading from the central por-' tion of said chamber and-an annular chamber surrounding the delivery end of said passage and adapted to dischargeinto the said chamber, a tip assembly, the saidassembly c0mprising a head block having a chamber exfor adapted to communicate with the passage for cutting oxygen in the head and the said tip member having a bore registering with the last two passages, a second tip member surrounding the first mentioned tip member and fitted within the chamber in the head block, the said tip members being provided with passages for preheating gases, there being an annular distributing chamber above the upper end of the outer tip member and surrounding the inner tip member into which the first mentioned passages in the head block are adapted .to discharge, a mixer in said head adapted to discharge substantially radially into the first mentioned annular cham ber and the said head being provided with ,passages for delivering oxygen and a combustible gas into said mixer, and means engagin the head block for securing the tip assembly within the first head chamber.

2. In a blowpipe, the combination of a head having ,a chamber extending upwardly from the lower end thereof, a pasage for cutting oxygen leading from the central portion of said chamber, a tip assembly, the said as sembly comprising a head block having a chamber extending upwardly from the lower end thereof with passages communicating with the first chamber and adapted to receive a combustible mixture from the said head, an inner tip member secured to the central portion of said head block, within the chamber thereof, the said block having a passage adapted to communicate with the passage for cutting oxygen in the head and the said tip member having a bore registering with the last two passages, a second tip member surrounding the first mentioned tip member and fitted within the chamber in the head block, the said tip members being provided with passages arranged to receive preheating gases from the corresponding passages in the head block, means in said head for delivering a mixture of preheating gases into the corresponding passages in said head block, and

means for securing said head block in the head chamber.

3. In a blowpipe the combination of a head having a chamber extending upwardly from the lower end thereof, a passage for cutting oxygen leading from the central portion of said chamber and an annular chamber surrounding the delivery end of said passage and adapted to discharge into the said chamher, a tip assembly, the said assembly comprising a head block having a chamber extending upwardly from the lower end thereof with passages communicating with the first chamber and adapted to receive a combustible mixture from the said annular chamber, an inner tip member secured to the central por tion of said head block, within the chamber thereof, the said block having a passage adapted to communicate ,with the passage for cutting oxygen in the head and the said tip member having a bore registering with the said passages, a second tip member surrounding the first mentioned tip member and fitted within the chamber in the head block, the said tip members being provided with passages for preheating gases and there an annular distributing chamber above the upper end of the outer tip member and surrounding the inner tip member into which the first mentioned passages in the head block are adapted to discharge, a mixer in said head adapted to discharge substantially radially into the first mentioned annular chamber and the said head being provided with passages for delivering oxygen and a combustible gas into said mixer,

' a washer interposed between the head block and the top of the chamber formed in the blowpipe head, the said washer having a central aperture for the passage of cutting oxygen and havingsegmental recesses surrounding the central portion and adapted to register with the annular chamber and with the first mentioned passages in the head block, and means engaging the head block for securing the tip assembly within the first head chamber.

4. In a blowpipe, the combination of a head having a chamber extending upwardly from the lower end thereof,a passage for cutting oxygen leading from the central portion of said chamber and an annular chamber surrounding the delivery end of said passage and adapted to discharge into the said chamber, a tip assembly, the said assembly COIH- prising a block having a chamber extending upwardly from the lower end thereof with passages communicating with the first chamber and adapted to receive a combustible mixture from the said annular chamber, an inner tip member secured to the central portion of said' head block, within the chamber thereof, the said block having a passage adaptedto communicate with the passage for cutting oxygen in the head and the said tip member having a bore registering with the said passages, a second tip member surrounding the first mentioned tip member and fitted within the chamber inthe head block, the said tip members being provided with passages arranged to receive preheating gases from the corresponding passages in the head block, means in said head for supplying preheating gases to said annular chamber, a washer interposed between the head block and the top of the chamber formed in the blowpipe head, the said washer having a central aperture for the passage of cutting oxygen and having segmental recesses surrounding the central portion and adapted to register with the annular chamber and with the first mentioned passages in the head block.

5. In a blowpipe, the combination of a head having a chamber extending upwardly from the bottom thereof and a passage for cutting oxygen leading upwardly from the central portion of said chamber, the said head having an annular chamber extending upwardlv from the first mentioned chamber and surrounding the said passage, a tip assembly removably secured to the first mentioned chamber and having preheating passages adapted to receive at their upper ends a preheating mixture from the second chamber and also having a central passage adapted to receive cutting oxygen from the first men- .for preheating oxygen and a passage for combustible gas communicating with the said mixing device.

6. In a blowpipe, the combination of a head having therein passages for cutting oxygen and for combustible gas and for preheating oxygen, a tip portion having a passage therethrough for cutting oxygen and passages for preheating gases, a block to which the aforesaid tip portion is secured and extending thereabove, the said block having a bore adapted to register with the passage for cutting oxygen in the head and passages adapted to conduct preheating gases from said head to the passages therefor in the said tip portion, and means for securing the said head block and the tip portion attached thereto to the blowpipe head.

7. A blowpipe comprising a head having therein a passage for cutting oxygen and passages for a combustible gas and for preheating oxygen, the said head having a chamber projecting upwardly from the bottom thereof, the lower portion of said chamber one or more passages adapted to receive combustible gas and oxygen from the blowpipe head and to deliver the same into the passages provided therefor between the inner and the I outer .tip members, and asleeve surrounding the outer tip member and threaded into the lower portion of the chamber in the blowpipe head thereby to force the head block against the seat provided therefor at the-top of the said chamber. I, y

In testimony whereof," ,I hreuntm aflix my signature.

JOHN HARRIS.

being threaded, a tip comprising an inner member having a central bore and an outer member surrounding the inner member, there heating gases from said blowpipe head and deliver the same to the passages therefor between the said tip members, and a sleeve surrounding the outer tip member and threaded. into the lower portion of the chamber in the blowpipe head thereby to force the head block against the seat provided therefor atthe top of the said chamber. a

8. A blowpipe comprising. a head having therein a passage for cutting oxygen and v passages for a combustible gas for preheating oxygen, the said head having a chamber projecting upwardly from the bottom thereof, the lower portion of said chamber being threaded, a tip comprising an inner member having a central bore and an outer member surrounding the inner member, there being passages for reheating gas formed between the said mem ers, the upper ends of the'said tip members being threaded and the inner tip member projecting beyond the outer tip member, and a head block having internally threaded portions into which the ends of the said tip members are screwed and provided with a bore adapted to register with the passages for cutting oxygen in the inner tip member and with the passage for such oxygen in the blowpipe head, the said head block also having 

